MC-LR removal performances under different AOPs were compared systematically. Higher removal efficiency and synergistic effects were obtained by combined process. The acute biotoxicity raised in different degrees after oxidation.
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Microcystin-LR attracts attention due to its high toxicity, high concentration and high frequency. The removal characteristics of UV/H
2O
2 and O
3/H
2O
2 advanced oxidation processes and their individual process for MC-LR were investigated and compared in this study. Both the removal efficiencies and rates of MC-LR as well as the biotoxicity of degradation products was analyzed. Results showed that the UV/H
2O
2 process and O
3/H
2O
2 were effective methods to remove MC-LR from water, and they two performed better than UV-, O
3-, H
2O
2-alone processes under the same conditions. The effects of UV intensity, H
2O
2 concentration and O
3 concentration on the removal performance were explored. The synergistic effects between UV and H
2O
2, O
3 and H
2O
2 were observed. UV dosage of 1800 mJ·cm
−2 was required to remove 90% of 100 mg·L
−1 MC-LR, which amount significantly decreased to 500 mJ·cm
−2 when 1.7 mg·L
−1 H
2O
2 was added. 0.25 mg·L
−1 O
3, or 0.125 mg·L
−1 O
3 with 1.7 mg·L
−1 H
2O
2 was needed to reach 90% removal efficiency. Furthermore, the biotoxicity results about these UV/H
2O
2, O
3/H
2O
2 and O
3-alone processes all present rising trends with oxidation degree of MC-LR. Biotoxicity of solution, equivalent to 0.01 mg·L
−1 Zn
2+, raised to 0.05 mg·L
−1 Zn
2+ after UV/H
2O
2 or O
3/H
2O
2 reaction. This phenomenon may be attributed to the aldehydes and ketones with small molecular weight generated during reaction. Advice about the selection of MC-LR removal methods in real cases was provided.
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